feat: added nullable and parameter tests

[TimothyMakkison]

• Added nullable return type tests for nullable objects and value types
• Added route parameter tests for nullable objects and value types

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.85%. Comparing base (6ebeda5) to head (b25fb5e).
Report is 126 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1863      +/-   ##
==========================================
- Coverage   87.73%   83.85%   -3.88%     
==========================================
  Files          33       36       +3     
  Lines        2348     2472     +124     
  Branches      294      346      +52     
==========================================
+ Hits         2060     2073      +13     
- Misses        208      317     +109     
- Partials       80       82       +2     

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[github-actions]

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